Arapahoe High School shooter planned to attack 5 areas of school

CENTENNIAL - The investigation into the Arapahoe High School shooting on Dec. 13 determined the shooter planned to attack at least five areas of the high school that day.

Arapahoe County Sheriff Grayson Robinson released new details Tuesday afternoon about the items the shooter brought with him into the school. He was armed with a 12-gauge, pump-action shotgun; three functional Molotov cocktails, a machete in a canvas scabbard and more than 125 rounds of assorted types of shotgun ammunition (steel-shot, buckshot and slug).

According to investigators, the shooter carried numerous rounds of shotgun ammunition in two bandoliers worn across his chest and waist and carried the remaining items in a backpack.

Investigators say the shooter used a permanent marker to write a phrase in Latin on the inside of his forearm. "Alea iacta est," translates into English as "the die has been cast."

The shooter had also five separate letters and numbers on his arm, which investigators say correlate with the library and classrooms nearby.

Investigators will try to determine whether the shooter had targeted anyone in any of those classrooms.

The shooting critically injured 17-year-old Arapahoe High School senior Claire Davis. The shooter died as the result of a self-inflicted gunshot while inside the high school library.

Sheriff Robinson says it appears that the shooter acted alone, but investigators are still looking into whether anyone may have helped the shooter in any way.